21488064463278 has 36 divisors (see below), whose sum is σ = 54158693088240. Its totient is φ = 6139446989256.

The previous prime is 21488064463253. The next prime is 21488064463301. The reversal of 21488064463278 is 87236446088412.

It is a happy number.

21488064463278 is a `hidden beast` number, since 2 + 1 + 48 + 8 + 0 + 64 + 463 + 2 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12181441558 + ... + 12181443321.

It is an arithmetic number, because the mean of its divisors is an integer number (1504408141340).

Almost surely, 2^{21488064463278} is an apocalyptic number.

21488064463278 is an abundant number, since it is smaller than the sum of its proper divisors (32670628624962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21488064463278 is a wasteful number, since it uses less digits than its factorization.

21488064463278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24362884901 (or 24362884891 counting only the distinct ones).

The product of its (nonzero) digits is 99090432, while the sum is 63.

The spelling of 21488064463278 in words is "twenty-one trillion, four hundred eighty-eight billion, sixty-four million, four hundred sixty-three thousand, two hundred seventy-eight".